Mechanisms for compensating for battery pack failure in powered surgical instruments

Abstract

A surgical instrument has a staple cartridge housing a plurality of staples and an anvil configured to capture tissue therebetween. The surgical instrument also has a firing assembly configured to deploy the plurality of staples into the captured tissue during a firing sequence, and a handle that includes an electric motor operably coupled to the firing assembly, wherein the electric motor is configured to motivate the firing assembly to deploy the plurality of staples into the captured tissue during the firing sequence, and a power pack. The power pack includes rechargeable battery cells configured to power the electric motor, at least one battery-cell health indicator, and an electronic control circuit configured to assess whether a subset of rechargeable battery cells is damaged during the firing sequence based on at least one measurement performed by the at least one battery-cell health indicator.

What is claimed is: 
     
       1. A surgical instrument, comprising:
 an end effector configured to capture tissue and receive a staple cartridge comprising a plurality of staples; 
 a firing assembly configured to deploy the plurality of staples into the captured tissue during a firing sequence; and 
 a housing, comprising:
 a motor operably coupled to the firing assembly, wherein the motor is configured to cause the firing assembly to deploy the plurality of staples into the captured tissue during the firing sequence; and 
 a power pack comprising:
 a plurality of rechargeable battery cells configured to power the motor; and 
 a sensor configured to detect a parameter associated with the plurality of rechargeable battery cells; and 
 
 
 an electronic control circuit configured to:
 determine, during the firing sequence, whether a subset of the plurality of rechargeable battery cells is damaged based on at least one measurement of the parameter performed by the sensor; and 
 step up an output voltage of the power pack to complete the firing sequence in response to a determination that the subset of the plurality of rechargeable battery cells is damaged. 
 
 
     
     
       2. The surgical instrument of  claim 1 , further comprising a voltage converter, wherein the electronic control circuit is configured to employ the voltage converter to step-up the output voltage of the power pack to complete the firing sequence in response to a determination that a subset of the plurality of rechargeable battery cells is damaged. 
     
     
       3. The surgical instrument of  claim 1 , further comprising a memory, wherein the electronic control circuit is configured to store a damaged status of the power pack in the memory in response to a determination that a subset of the plurality of rechargeable battery cells is damaged. 
     
     
       4. The surgical instrument of  claim 3 , wherein the damaged status is cleared after a damaged subset of the plurality of rechargeable battery cells is replaced with undamaged battery cells. 
     
     
       5. The surgical instrument of  claim 1 , wherein the electronic control circuit is configured to deactivate the surgical instrument after completion of the firing sequence in response to a determination that a subset of the plurality of rechargeable battery cells is damaged. 
     
     
       6. The surgical instrument of  claim 5 , wherein the surgical instrument is reactivated after replacing the power pack with an undamaged power pack. 
     
     
       7. The surgical instrument of  claim 1 , further comprising a feedback indicator, wherein the electronic control circuit is configured to employ the feedback indicator to issue an alert in response to a determination that a subset of the plurality of rechargeable battery cells is damaged. 
     
     
       8. A surgical instrument, comprising:
 an end effector configured to capture tissue and receive a staple cartridge comprising a plurality of staples; 
 a firing assembly configured to deploy the plurality of staples into the captured tissue during a firing sequence; 
 a housing, comprising:
 a motor operably coupled to the firing assembly, wherein the motor is configured to cause the firing assembly to deploy the plurality of staples into the captured tissue during the firing sequence; and 
 a power pack comprising:
 a plurality of rechargeable battery cells configured to power the motor; and 
 at least one temperature sensor configured to take at least one temperature reading of the power pack during the firing sequence; and 
 
 
 an electronic control circuit in communication with the at least one temperature sensor, wherein the electronic control circuit is configured to step up an output voltage of the power pack during the firing sequence in response to a determination that the at least one temperature reading exceeds a predetermined value. 
 
     
     
       9. The surgical instrument of  claim 8 , wherein the electronic control circuit comprises a memory, and wherein the electronic control circuit is configured to store the predetermined value in the memory. 
     
     
       10. The surgical instrument of  claim 8 , further comprising a memory, wherein the electronic control circuit is configured to store a damaged status of the power pack in the memory in response to the determination that the at least one temperature reading exceeds the predetermined value. 
     
     
       11. The surgical instrument of  claim 10 , wherein the damaged status is cleared after a damaged subset of the plurality of rechargeable battery cells is replaced with undamaged battery cells. 
     
     
       12. The surgical instrument of  claim 8 , wherein the electronic control circuit is configured to deactivate the surgical instrument after completion of the firing sequence in response to the determination that the at least one temperature reading exceeds the predetermined value. 
     
     
       13. The surgical instrument of  claim 12 , wherein the surgical instrument is reactivated after replacing the power pack with an undamaged power pack. 
     
     
       14. The surgical instrument of  claim 8 , further comprising a feedback indicator, wherein the electronic control circuit is configured to employ the feedback indicator to issue an alert in response to the determination that the at least one temperature reading exceeds the predetermined value. 
     
     
       15. A surgical instrument, comprising:
 an end effector configured to capture tissue and receive a staple cartridge comprising a plurality of staples; 
 a firing assembly configured to deploy the plurality of staples into the captured tissue during a firing sequence; 
 housing, comprising:
 a motor operably coupled to the firing assembly, wherein the motor is configured to generate at least one rotational motion to motivate the firing assembly to deploy the plurality of staples into the captured tissue during the firing sequence; and 
 a power pack comprising:
 a plurality of rechargeable battery cells configured to power the motor; and 
 a voltage sensor configured to take at least one voltage reading of an output voltage of the power pack during the firing sequence; and 
 
 
 an electronic control circuit in communication with the voltage sensor, wherein the electronic control circuit is configured to step up the output voltage of the power pack during the firing sequence in response to a determination that the at least one voltage reading is below a predetermined value. 
 
     
     
       16. The surgical instrument of  claim 15 , wherein the electronic control circuit comprises a memory, and wherein the electronic control circuit is configured to store the predetermined value in the memory. 
     
     
       17. The surgical instrument of  claim 15 , further comprising a memory, wherein the electronic control circuit is configured to store a damaged status of the power pack in the memory in response to the determination that the at least one voltage reading exceeds the predetermined value. 
     
     
       18. The surgical instrument of  claim 17 , wherein the damaged status is cleared after a damaged subset of the plurality of rechargeable battery cells is replaced with undamaged battery cells. 
     
     
       19. The surgical instrument of  claim 15 , wherein the electronic control circuit is configured to deactivate the surgical instrument after completion of the firing sequence in response to the determination that the at least one voltage reading exceeds the predetermined value. 
     
     
       20. The surgical instrument of  claim 19 , wherein the surgical instrument is reactivated after replacing the power pack with an undamaged power pack.